scanner: Mark fail() as noreturn

Help static analysers by letting them know that once we fail(),
execution will terminally complete.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>

src/scanner.c

@@ -371,7 +371,7 @@ desc_dump(char *desc, const char *fmt, ...)
 	putchar('\n');
 }
 
-static void
+static void __attribute__ ((noreturn))
 fail(struct location *loc, const char *msg, ...)
 {
 	va_list ap;